Collapsible core for building tires



iran STATES .rn f a .ioHN YEMIKER, lor AKRON, OHIO.

i.. a l m ooLLiirsiiaL cone' 'Fon BUILDING Tiniis.

'mental sections' of a separable or knockdown tire building core may be quickly and f'accurately brought into and held .in proper relation to one anotherand quickly disconnected when the core is to be knocked down preparatory to -removal .fromrthe finished tire casing.

The object of the invention is to provide means whereby the several segmental sections of the c ore may be quickly'and accurately brought into proper relation to one another.

A vfurther object is to. provide. a core of the character referred lto with means for drawing the segmental sections of the core tightly together. 3

The objects of the invention 'may be attained by providingthe several segmental sections of the core withconcentric grooves which form a complete annular 'groove whenthe sections are placed together in the proper relationship. These grooves are straight uponeach side for a' portion of the way and then tapered inwardly, the Wall of'the groove nearest the center being provided with a straight portion .of-greater depth than the wall farthest'from the center.

Although the drawings and above specilcation disclose thebest mode in which have contemplated embodying my' invention I desire to be not limited to the details of such disclosures, for, in the further practical applicationv of my invention, many changes Ain the forimproportions, size and minor detaiis of construction may be made within the scope of the appended claims, without departing from the spirit or sacricing any of the advantages of the invention.

-The invention thusV set forth, in general 'terms is illustrated in the accompanying drawings formingy part hereof, in which- Figure 1 is a side elevation of a core embodying the invention.

i Fig. 2 atransverse section through the core, showing the 'ring partiallydriven home.

Specicationof Letters Patent. Application filed'liebruary 11, 1919. Serial No. 276,276.

'the purpose of receiving ring is of the form shown in cross section,A lbeing straight fora portion of the way upon l channel is in cross Patented Nov. 4L, 1919.

Fig. 3 a similar View showing-the ring driven home. i

Fig. i a transverse section through a portion of the ring. i

-A 'practical embodiment of the invention is disclosed in. the accompanying drawings, forming a part of this specification in which similar numerals of reference indicate corresponding parts throughout thev several views.

The core isfcomposed of a plurality of `separable sections which are segmental in form and of proper size and shape to permit a tire casing to be bu'ilt tlierearouvnd and are 'provided with enlarged fianges formed at their inner edges, r'

ctangular in cross section and connected to the main portion of the sections by reduced. necks.

areJ shown and are designated b v the numerals l and 2, the sections 1 being of substantially the form shown and the segmental section soformed that said section can be removed after the ring' has been detached. Each of tlie sections' mental channel," which channels are for the ring 3. This each side and then tapered upon each side toward the bottom, the straight portion upon the inner edge of the ringy being longer than thestraight portion upon the outer edge of the ring, thus making the tapered portion of the inner edge of the ring shorter than the tapered portion on the outer eel'ge of the ring. As illustrated in the drawing .the ring is provided on the inner'face with the com extending from the top to a point near the rcenter of the ring; and with the slightly tapered portion 5 extending to the bottom edge of the ring and upon the outside with the 'comparatively Short straight portion 6 near the topl of the ring and the coinparatively longtapered portion 7 extending to the bottom of the ring. The curved channel in each segment of the core conforms in' cross section to the shape of the ring, that is it is straight for a portion of the wav edge from 'the top and then 'tapered to the boti- The inner edge ofe'aclitom of the channel.

section straight for a portion of the way from the top as indicated at S'and then tapered to the bottom of the channel as sliownyatl 9, while the n In the-accompanyirig drawings four of these Sections paratively long straightA portion 4' 8O is .provided with a segand then tapered to the bottoni of the channelv as shown at 11. Cores of the character to Which this invention relates are made up of a series of segmental sections in order that the core may be removed from the finished casing, but while the core is in use it is necessary to hold all (it-the segments tightly together and to draw all ot said segments toward a common center in order that a perfect'circle is produced by the several segments. In order to accomplish this result the ring 3 and the channels are formed in cross section as above described and illustrated in the accompanying drawings, thus allowing the ring to be quickly centered when it is placed in position in the channels and drawing all oi the 'segmental sections uniformly tow ard the center as the ring is driven into position. p

Inl assembling-the core for use the segments are placed together in the proper position and the ring placed in the circular channel formed by the channels ot the several segipental sections. The lower 4portion of the ring being tapered upon both sideswill allow the ring to be quickly centered With reference vto the channels and the ring will assume a position substantially as shown inltig. 2. As the ring 1s driven tighter into the channelit'will be seen Vthat all of the segmental lsections Will be driven toward the center,

owingto the tapered :t'ace upon the inner edge of the ring engaging the tapered face on the inner edge of'the channel beforethe tapered outer edge 'ot' the ring engages the tapered outer edge ot the channel. It should be noted that the taper upon the ring vand channel is exaggerated in the drawings for the purpose of illustration, but only a slight taper is required upon the actual ring and core in order to causethe ring to frictionally engage the channel in the core. For the purpose of quickly removing the ring When .it

is desired to knock down the core apertures 12 are providedthrough the underside of the core 'for the insertion -oi: a punch to remove the ring. p

Although the drawings and above speciiication disclose the best mode in which I have contemplated embodying my invention I desire to benot limited to the details of such disclosure, for, in the Jfurther practical application of my invention, many changes `in forni and construction may be lmade, as'

circlln'lstances require or experience suggests, without departing from the spirit of the invention, within the scope ot' the appended claims.

I claim l.v A core ot the character described, co1nprising a plurality ot separable sections having1 inwardly extending portions provided with channels Whichin the assembled condition of the sections provide an annular channel and an annular ring insertible in said channel, said ring heilig straight upon cach side in cross section for a portion ot the way and then tapered upon eachside and said channel conforming in cross section to `said ring.

2., A core of the character described, comprising a plurallty ot separable sections having inwardly extending portions provided with channels which in the assembled condition of the sections provide an annular channel and an annular ring insertible in said channel, said ring being straight for a portion of the way upon each side in cross section and then tapered lupon each sidejthe straight portion upon the inner edge ofthe ring being longer than the straight portion upon the outer edge of the ring, said 'channel being shaped in cross section to conform to the ring.A l In testimony that I claim the above, I

f have hereunto subscribed my name.

.Joint rai/nnen. 

